What is the separation of powers in US politics?

Ok, so the Seperation of Powers is the Seperation between the 3 main political bodies in the United States, that is, the President, Congress (the equivelent to Parliament in the UK) and the Supreme Court. The US constitution (the document that sets the basis for all US laws) sets out that in order to avoid 'tyranny', whereby one of the three powers listed above can influence extensive power without being able to be restrained by the other areas of government. They saw that in British politics at the time, that the monarchy had extensive control over British politics, so as to never repeat this the US constitution set this as a rule in the first two Articles of the US constitution to provide Checks and Balances in the system, where each branch of government can ensure that no one of the three bodies of power gains too much influence. Now known as the seperation of powers.